New pc build help and questions.

Hello, I am going to build a pc soon for gaming (first time home build) and this is overall what I have so far.

SAMSUNG CD/DVD Burner Black SATA Model SH-222AB - OEM

APEVIA X-PLORER2 Series X-PLORER2-RD Black / Red Steel ATX Mid Tower Computer Case

Seagate Barracuda 7200.12 ST3500413AS 500GB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

ASRock M3A770DE AM3 AMD 770 ATX AMD Motherboard

Intel EXPI9301CTBLK 10/ 100/ 1000Mbps PCI-Express Network Adapter.......Because I have wirless :3.

SAPPHIRE 100314-3L Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card

G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Dual Channel Kit Desktop Memory Model F3-10600CL8D-4GBHK

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGMBOX

And finally the thing that I am worried about.

Antec's EarthWatts EA-430D Green

This was reccomended and I am unsure if it will cut it....

Can anyone give me some insight or anything that you would change.